Improvement in devices for forming letters on the circumference of metal disks



s. M. OTT.

Improvement in Devices for Forming Letters .on the Circumferenceof MetalDisks.

N0. 124,970. Patented March26,1872.

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STEPHEN M. orr, 0E NEWARK, NEW JERSEY.

IMPROVEMENT IN DEVICES FOR FORMING LETTERS ON THE CIRCUMFERENCE 0F METALDISKS.

Specification forming part of Letters Patent No. 124,970, dated March26, 1872.

Specification describing a new and useful Improvement in Forming Lettersupon the Circumferen cc of a Metallic Disk, invented by STEPHEN M. Orr,of Newark, in the county of Essex and State of New Jersey.

Figure l is a side view of my improved device, partly in section,through the line as m, Fig. 2. Fig. 2 is a top view of the same.

Similar letters of reference indicate corresponding parts.

My invention has for its object to furnish an improvement in formingraised letters and other devices upon the edges or circumferences ofmetallic disks, which will enable said devices to be formed moreaccurately and at much less expense than when engraved upon said edgesin the ordinary manner; and it consists in the construction andcombination of the various parts of the device, as hereinafter morefully described.

A is the stand or bed, the top of which is made circular, or has acircular projection of suitable size "formed upon it, the outer surfaceof which has a screw-thread out upon it to receive the screw-thread outupon the inner surface of the lower part of the collar B. The upper partof the collar B projects inward, and its inner surface is inclined,beveled, or made in the form of a section of a cone, as shown in Fig. 1.O are the dies, which are made in the form of sections of a ring-plate,as shown in Fig. 2, the inner surface of said dies forming thecircumference of a circle of the same size as the wheel or disk to bemade or operated upon. The outer surface of the dies 0 is beveled,inclined, or made conical in the same direction as the beveled innersurface of the upper part of the collar B, so that when the said collaris screwed down it may force the segmental dies 0 closely together. Thedies 0 may be made so that two or any desired number of segmental diesmay form a perfect circle. Upon the inner surface of the segmental dies0 are sunk the letters or other devices to be raised upon thecircumference of the disks This device is designed especially to formthe letters upon the wheels of printing-telegraph instruments, handstamps, 850., but may be used with equal advantage for various otherpurposes. V In this way the letters will be formed more uniformly andaccurately than is possible when they are engraved in the ordinarymanner, and at very much less expense.

Having thus described my invention, I claim as new and desire to secureby Letters Patent The combination of the screw-collar B, constructedsubstantially as herein shown and described, with the segmentalring-dies O and bed or table A, as and for the purpose set forth.

STEPHEN M. OTT. Witnesses:

. GERMAIN HAUSCHEL,

J OHN H. GRoss.

